It's all pretty damned frustrating, but this emotional perseveration on prior stress is galling in some particular ways. I find myself focusing on serious problems of the past, such as the ending of prior relationships, at times and with energy levels which are highly inappropriate. We're talking about stuff that's done and gone and dealt with, but I begin to re-experience the stress and emotional trauma as if they are current or recent events.
Lakeshore - [cancer] Entering a new phase of cognitive disfunction - emotional perseveration
I get this happening to me as well. I suppose that it is brain damage from the MS, in my case.